Overview
A British agent's son is kidnapped and held for a ransom of diamonds. The agent finds out that he can't even count on the people he thought were on his side to help him, so he decides to track down the kidnappers himself.
Trailer
Crew
DirectorDon Siegel
WriterLeigh Vance
Cast
Michael Caine
Maj. John Tarrant
Donald Pleasence
Cedric Harper
Delphine Seyrig
Ceil Burrows
Clive Revill
Alf Chestermann
John Vernon
McKee
Joss Ackland
Chief Supt. Wray
Janet Suzman
Alex Tarrant
Catherine Schell
Lady Melissa Julyan
Joseph O'Conor
Sir Edward Julyan
Denis Quilley
Bateson
Derek Newark
Monitoring Policeman
Edward Hardwicke
Mike McCarthy
Maureen Pryor
Jane Harper
Joyce Carey
Miss Monley
Preston Lockwood
Ilkeston
Molly Urquhart
Margaret
David Daker
MI5 Man
Hermione Baddeley
Hetty
Patrick Barr
Gen. St. John
Yves Afonso
Jacques (uncredited)
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Keywords
london, englandparis, francechasediamondransomundergroundspysubwaysonrevengemurdervigilanteagentgunrunner
Details
Budget
$2M
TMDb Votes
95
Added May 14, 2026Updated Jun 4, 2026